Resistance of field strains of Haemonchus contortus to ivermectin, closantel, rafoxanide and the benzimidazoles in South AfricaJ.A. Van Wyk, F. S. Malan|Veterinary Record|1988Cited by 218
How long before resistance makes it impossible to control some field strains of Haemonchus contortus in South Africa with any of the modern anthelmintics?J.A. Van Wyk, J.L. Randles, F. S. Malan|Veterinary Parasitology|1997Cited by 173
Clinical evaluation of anaemia in sheep: early trials.F. S. Malan, Carsten Wessels, J.A. Van Wyk|PubMed|2001Cited by 121